# C4W1 Working with Generated Time Series grading problem “series\_valid” not defined **URL:** \ **Category:** Sequences, Time Series and Prediction\ **Tags:** tensorflow, week-module-1\ **Created:** [February 17, 2025, 9:19pm UTC](https://community.deeplearning.ai/t/c4w1-working-with-generated-time-series-grading-problem-series-valid-not-defined/771909 "2025-02-17T21:19:06Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![Deepti\_Prasad](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/deepti_prasad/32/165831_2.png) [@Deepti\_Prasad](https://community.deeplearning.ai/u/Deepti_Prasad)\ **Post date:** [February 18, 2025, 5:26am UTC](https://community.deeplearning.ai/t/c4w1-working-with-generated-time-series-grading-problem-series-valid-not-defined/771909/4 "2025-02-18T05:26:02Z")
refer the below comment thread to debug your code. > [@C4W1 Assignment compiling error resulting in 0 points](https://community.deeplearning.ai/t/c4w1-assignment-compiling-error-resulting-in-0-points/705962/9): > > hi @edmos7 When you do now correction please make sure to get a fresh copy of assignment and only write codes between assigned markers ###START AND END CODE HERE### and making sure not to delete the already given instructions and do not add your own way of writing the codes. You suppose to only replace None placed between the Markers ###START AND END CODE HERE### without editing the already given instructions or part of codes already given to you when you first open the assignment notebook. By… --- _[View the full topic](https://community.deeplearning.ai/t/c4w1-working-with-generated-time-series-grading-problem-series-valid-not-defined/771909)._